Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fab94833e3b0cc2…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 06:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8fce484582e9ecd4d9b378676daad299 SHA-1: d92f0406cdbcb276d662d1e3f35f4387e1d956e8 SHA-256: 8fab94833e3b0cc239bd3b0d2b1051c0b577f493bf3defc21377bc770f9ac608
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF structure point towards an attempt to direct users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://webvitamin.vn/app/webroot/uploads/files/vitokefekud.pdf In PDF document text
    • http://rajskiewakacje.pl/userfiles/file/letulenuzovixavasegizira.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/15713670629.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210827_200352.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/kakelar.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/gorewe.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/lejetolipe.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/rm3f6qi87qj0hik4mg8t9lent4/volokozu.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/babazej.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608695bace855---zijovenabiw.pdfIn PDF document text
    • https://biomisszio.hu/tmp/xatererivejixevene.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf07ad83e2---mijokun.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/22be6b80e4379a33e31def7f05e2c0d0/13190228982.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/c59be733cc50ef0e7b1e5e8d236cff04/vovofena.pdfIn PDF document text
    • http://thedreams.cz/files/dilanibibef.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe4124218b---debufusoduxudemerizi.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ea1b03048---16292359047.pdfIn PDF document text
    • https://areicon.com/images/file/737982509.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/werozemudijagifitabako.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/nivavuguviwer.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/85412116007.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a633b60cebe---toxudo.pdfIn PDF document text
    • https://shopabrang.com/images/files/58241424980.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/ae70d281f93ef065fbf4aaf098aad05c/vogebaf.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/jfoaqq8arkh9pdfb9fg2kqahsv/sironokodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=compound+and+complex+sentences+worksheet+with+answer+keyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B1 11304 bytes
SHA-256: de4f98c42d60ce59c4c753b0b091e9b9500f1f1a4e7dadb55283911cef846a51
font_01_sfnt_off0000f022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF022 17420 bytes
SHA-256: 6db63f7a9c0458817fe7ef3966c8f6ed39b4840e9ad46f60e59508d982defc8c
font_02_sfnt_off00011cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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